Spark-plug.



F. MOENCH.

SPARK PLUG.

APPucmoN man luNE 23,1915.

1 1 72, 1 59 Intnted Feb. 15, 1916.

W/ T11/ESSE S: /NVEN 70H A TTUHNE VS FREDERICK MOEN'CH, OF B'IJ'SHVILLE, ILLINOIS.

SPARK-PLUG'.

Specification o! Letters Patent.

Patented Feb. 15, 1916.

Application led J une 23, 1915. Serial No. 35,780.

To all whom it may concern Be it known that I, FRED1-JRICK MoENoH, a citizen of the United States, and a resident of Rushville, in the county of Schuyler and State of Illinois,l have invented a certain new and useful Improvement in Spark- Blugs, of which the following is' a specificat1on.

My present invention relates to spark plugs, my object being to providea substantially integral structure which will be strong and durable in use, neat and simple in appearance, and which may be more readily and economically manufactured than the spark plugs now in use.

Vith these objects in mind my invention resides in the details of construction to be now described with reference to the accompanying drawing which forms a part of this specification, and 'in which the figure is a central longitudinal section through my improved insulator.

Referring now to this figure, it will be seen thatI provide a hollow Anut A, through the bore of which the insulator B extends,

said nut forming a single/piece base in viewof the particular connections proposed by this invention between the nut and the insulator just mentioned, and, which will be hereinafter' described, such connections doing away with the use of the usual thread.-

ed gasket for connecting the insulator to the base. It will thus be seen that but a single set of threads A arenecessary upon the vbase constituted by the nut A, the latter including also a polygonal portion A2 by means of which it may be quickly threaded into, and removed from, the proper cylinder opening.

The connections just ,mentioned between the base A and the insulator B, areiforrned at C. and C', at the respectively opposite ends of the nut A, and from aluminum solder according to a process which forms the subject matter of a separate application, such' connections permanently uniting the porcelain with the base or nut A and acting as reinforcements for the porcelain B.

It will be noted that the inner end of the porcelain B, as indicated atB, projects beyond the inner end of the nut A, the inner end of whose bore is completely closed, and that this inner end of the porcelain B is further reinforced by a similar soldered connection D uniting therewith the inner end of lthe central electrode E, the opposite end of which has a soldered aluminum cap E seated upon the outer end of the porcelain B. The other or bent.' electrode D which is secured into the body or nut A, has one end thereof bent into contiguous relation to the inner end of the central electrode E, and these ends are preferably provided with platinum tips D2 as plainlyshown. Thus the aluminum connections at C, C', D and E serve to permanently and rigidly unite the several parts of myl improved spark plug, strengthening the same, increasing its durability and effectiveness, and permitting of its manufacture in a more ready and economical manner than is possible with the spark plugs now in general use.

I claim z# l. A spark plug consisting of an insulator, a threaded base through which the insulator extends, an electrode extending through ythe insulator, and soldered metallic connections between the said electrode and the insulator and between the insulator andthe said base, and permanently uniting these parts to form a substantially single piece plug, said soldered connections being'located at the inner ends of the insulator and nut whereby to permanently close the spaces between the same and the electrode.

2. A spark plug comprising a nut forming a single piece base, an insulator extending through the saidA nut, and permanent soldered connections between the insulator and the nut located 'at the opposite ends of the latter and around the insulator whereby to permanently close the space between them.

3. A spark plug comprising a nut forming a single piece base, having a bore and a single series of threads, an insulator eX- tending through the bore of the said nut and projecting at its inner end beyond the inner end of the nut, soldered metallic connections between the said insulator and the said nut, located at the respectively opposite ends of the nut and entirely closing the ends of its bore, and electrodes carried by the said insulator and the said nut.

FREDERICK MOENCH. 'Witnessesz DON GARRIsoN, H. H. SPEED. 

